“…Percival and Stewart (1924) have shown that the blood calcium level in chilblains is consistently normal and that there is no improvement by raising the blood calcium level by means of parathyroid. With regard to Calciferol, Anning (1947) found in a series of over 100 tuberculous patients receiving treatment, throughout the winter months, with high doses of calciferol (tab. ostelin, high potency, Glaxo) chilblains were just as frequent as in a series of controls, tuberculous and non‐tuberculous, who did not receive calciferol.…”